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DEH-41473
Exhaust Plenum End Cap
If one end of the exhaust plenum system above the
switchgear is required to be closed, an end cap (Figure 5.9)
can be installed as follows:
1.
Using the 3/8-16 x 1 inch carriage bolts, lock washers
and hex nuts provided, attach the upper and lower
two corners of the flanges together and torque to 25-
30 ft.-lbs. (Figure 5.9).
2.
Using the #12-24 x 7/8 inch self-thread forming
screws (Figure 5.10), complete attaching the end cap
to the end flange. Torque the screws to 4-5 ft.-lbs.
CAUTION: If properly aligned, there should be no air
gap between the transition adapter and the exhaust
plenum flange.
NOTICE: As an option, a fire rated 440 butyl sealing
compound may be applied between exhaust plenum
flanges.
Exhaust Plenum End Portal
The exhaust plenum end portal should be located on an exit
wall (Figure 5.11) from the equipment room and secured to
this structure.
If the exit point of the equipment room is an exterior wall, the
securing of the exhaust end portal must include methods to
prevent water ingress between the exhaust end portal and
the structure wall.
Care and consideration should be taken when selecting the
exhaust end portal location. An area of at least 10 feet in all
directions from the exhaust end portal needs to be clear of
obstruction and access to this area should be restricted to
ensure the safety of personnel.
Recommended attachment means are identical to those
shown in Figure 5.10.
The exhaust end portal hinged flap is secured in place with a
self-thread forming screw. Behind the hinged flap, a standard
rodent screen is provided. An optional moisture absorbent
foam material may be located between the rodent screen
and hinged flap.
Care should be taken to ensure the flap is secured, closed and
flat against the exhaust portal assembly.
WARNING: An area of at least 10 feet in all directions
from the exhaust end portal should be free and clear of
personnel and obstructions to allow safe passage of
exhaust gases during an internal arcing fault within the
equipment. Failure to do so may result in serious injury or
death.
©2016 General Electric. All rights reserved.
Courtesy of NationalSwitchgear.com
AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 5. Exhaust Plenum Installation
Figure 5.9 Exhaust plenum end cap
3/8-16 x 1 inch Carriage Bolts
(1)
Figure 5.10 Attaching end flange (hardware)
Figure 5.11 Typical exhaust portal assembly
Exhaust Plenum End Portal Assembly
(1)
Structural Wall
(2)
Exhaust Plenum End Portal Hinged Flap
(3)
40
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